Spinning chamber for removing impurities from fibers



Sept. 5, 1967 j RIPKA ET AL 3,339,359

SPINNING CHAMBER FOR REMOVING IMPURITIFTS FROM FIBERS Filed Dec. 19, 1966 3 Sheets-Sheet l Sept. 5, 1967 JT R|PKA ET AL 3,339,359

SPINNING CHAMBER FOR REMOVING IMPURITIES FROM FIBERS Filed Dec. 19, 1966 5 Sheets-Sheet 2 Filed Dec. 19, 1966 Sept. '5, 1967 Hum E AL 3,339,359

SPINNING CHAMBER FOR REMOVING IMPURITIES FROM FIBERS 3 Sheets-Sheet 3 INVENTORS United States Patent 3,339,359 SPINNING CHAMBER FOR REMOVING IMPURITIES FROM FIBERS Josef Ripka, 1019 Nadrazni, and Jifi Lanta, 317 Hlavni, both of Usti nad Orlici, Czechoslovakia; Milan Chrtek, 1708 Jeremenkova, Ceska Trebova, Czechoslovakia; and Milan Marsalek, 314 Dukla, Usti, nad Orlici, Czechoslovakia Filed Dec. 19, 1966, Ser. No. 603,06 Claims priority, application Czechoslovakia, Dec. 20, 1965, 7,660/65 18 Claims. (Cl. 57--58.89)

ABSTRACT OF THE DISCLOSURE Fibers supplied to a rotary spinning chamber are moved by the centrifugal force along an inner frustoconical surface which has an annular groove in which the fibers are retained, while impurities continue to travel on the frusto-conical surface and pass out of discharge openings. A fiber strand is formed of the fibers collected in the groove and withdrawn through a withdrawal means which forms a fiber inlet chamber and a discharge chamher in the spinning chamber, and defines with the frustoconical surface a narrow annular passage for the impurities.

Background of the invention The present invention relates to an improvement of rotary spinning chambers of the type which form a fiber strand of fibers supplied into the spinning chamber and have an axial opening through which the fiber strand is withdrawn while being twisted due to the rotation of the spinning chamber. Spinning chambers of this type have escape openings through which air is discharged during rotation of the spinning chamber by the action of the centrifugal force, so that negative pressure prevails in the spinning chamber for sucking the supplied fibers into the spinning chamber. The spinning chambers according to the prior art have two opposite fr-usto-conical inner surfaces which form together an annular groove for collecting fibers in the region of the greatest diameter of the spinning chamber. The prior art constructions have the disadvantage that impurities contained in the fibers are necessarily left in the fiber strand spun of the collected fibers. Statistically it has been found that about 60 to 70% of breakages are caused by impurities contained in the supplied fibers and spun into the fiber strand of which a twisted yarn is formed.

Since the escape openings of the prior art are used for the discharge of air, they are small radial bores which have to be drilled into the spinning chamber walls in a time cons-uming and expensive operation, considering the great number of spinning chambers provided in a spinning apparatus.

Summary of the invention It is one object of the invention to overcome the disadvantages of spinning chambers according to the prior art, and to provide a spinning chamber in which impurities are automatically separated from the fibers and discharged so that the spun yarn is substantially free of impurities, and the number of yarn breakages is reduced.

Another object of the invention is to use the air escape openings of known spinning chambers, for the discharge of impurities.

3,339,359 Patented Sept. 5, 1967 Another object of the invention is to construct the air escape openings in such a manner that impurities separated from the fibers are reliably discharged, and not retained on the inner wall surface between adjacent openings.

Another object of the invention is to supply the fibers to the spinning chamber in such a manner that they are reliably deposited on the inner surface of the spinning chamber and are not displaced by air currents in the spinning chamber.

With these objects in view, an embodiment of the invention comprises a rotary spinning chamber having an outwardly flaring annular inner surface having a narrower end and a wider end; fiber inlet means communicating with said spinning chamber at said narrower end for placing fibers containing impurities on the inner surface so that fibers and impurities travel on the same toward the wider end due to the action of the centrifugal force; discharge means, for example circumferential openings, communicating with the rotary spinning chamber at the wider end of the inner surface; and annular fiber retaining means, such as an annular groove, located on the inner surface intermediate the ends of the same for retainiug the fibers. The fiber retaining means is constructed in such a manner as to permit continued movement of the impurities on the inner surface toward the discharge openings. The air ejected by the centrifugal force through the discharge openings, entrains and carries the impurities out of the discharge openings.

The term impurities is used in the present application to describe foreign particles contained in the fibers. For example, crushed cotton seeds and burr remainders are always contained in the fibers, and cannot be separated by conventional spinning chambers from the fibers so that they either cause a failure of the spinning unit, or are spun into the yarn which causes breakages.

In the construction of the present invention in which the fiber collecting groove is disposed on a continuously outwardly flaring inner surface, the impurities are urged by the centrifugal force to cross the fiber collecting groove and to move toward the wider end of the flaring inner surface and out of the discharge openings. If a smaller impurity enters the groove, it is lifted out by the spun fiber strand which is withdrawn from the groove. This may require several revolutions of the spinning chamber for repeatedly lifting the impurity. Only extremely small impurities remain in the groove with the fibers and are entrained in the spun fiber strand, but since the size of the impurities is small, they do not impair the quality of the spun yarn, and do not cause yarn breakages.

In the preferred embodiment of the invention, a withdrawal means for the spun fiber strand is disposed in the spinning chamber intermediate the ends of the flaring inner surface and in the region of the fiber retaining groove for separating the fiber inlet from the discharge openings. An annular portion of the withdrawal means forms a narrow annular passage for the impurities with the impurities with the annular inner surface. The fiber withdrawal means is stationary and has an annular gap in the above-mentioned annular portion located opposite j the fiber retaining groove. The gap opens into an inner of the same, so that the supplied fibers cannot be sucked into the region of the discharge openings.

The discharge openings are disposed so that the inner ports of adjacent discharge openings meet at the inner surface of the spinning chamber to form edges on the same which facilitate the passage of impurities through the discharge openings since it is not possible that impurities gather at surface portions between two adjacent discharge openings.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.

Brief description of the drawing FIG. 1 is an axial sectional view of a spinning chamber according to one embodiment of the invention;

FIG. 2 is an axial sectional view of a spinning chamber according to a modified embodiment of the invention;

FIGS. 3, 4 and 5 are sectional views taken on line A-A in FIG. 1, and illustrating modified constructions of the discharge openings of the spinning chamber;

FIG. 6a and FIG. 6b are fragmentary axial sectional views illustrating on an enlarged scale, two modified constructions of the fiber retaining groove; and

FIG. 7 is a schematic general view, partially in section, including a circuit diagram, and illustrating a spinning apparatus in which the spinning chamber of the invention is used.

Description of the preferred embodiments Referring now to the drawings, and more particularly to FIGS. 1 and 2, the rotary spinning chamber has two parts 2 and 3 joined in a plane perpendicular to the axis of rotation 0. Suitable fastening means, not shown, connect the two parts for rotation together. Part 3 has a circular flange with a planar annular bottom face which closes recesses 20 formed in a flange 4 of part 2 which has an annular planar face abutting the planar face of flange 3. The recesses 20 may be shaped as shown in FIGS. 3, 4 or 5, and are constructed in such a manner that adjacent recesses meet in edges 23 on the inner surface of part 2. Due to the fact that the open recesses are closed by the flange of part 3, they form discharge openings for the spinning chamber 1, without requiring drilling which is necessary in the construction of the prior art.

Spinning chamber 1, and more particularly part 2, has a frusto-conical outwardly flaring inner surface 5 having a narrower end and a wider end. The wider end is provided with the discharge means 4, 20, and the narrower end is closed by a stationary plate 13 provided with a fiber inlet tube 12 which is slanted to the axis of rotation of the spinning chamber and supplies fibers 24 containing impurities to the portion of the flaring inner surface 5 located adjacent cover plate 13.

A fiber retaining means in the form of a circular groove 7 is provided in the frusto-conical inner surface 5 substantially equidistant from the ends of the same. Fibers supplied to the narrower end of inner surface 5 will be urged by the centrifugal force to move toward fiber retaining groove 7 and into the same. Impurities which are not retained by groove 7 due to different texture, mass, shape, or dimensions as compared with the fibers, are urged by the centrifugal force to move further on the frusto-conical surface 5 and into the discharge openings 20 through which they are discharged. At the same time, air is drawn into the interior of spinning chamber 1, and discharged by the action of the centrifugal force through discharge openings 20 so that the ejection of the impurities is reliably accomplished. Due to the fact that the discharge openings are separated by edges 23, as best seen in FIGS. 3, 4 and 5, no impurities can be deposited on surface portions between two adjacent discharge openings 20.

Withdrawal means for a fiber strand P spun of the fibers during rotation of the spinning chamber are located in the spinning chamber and include two parts. The first part 8 is substantially funnel-shaped and has an outlet tube 17 passing through a central bore in cover plate 13 and being secured to the same. The main portion of the funnel-shaped part 8 is frusto-conical and has a circular edge forming a narrow circular passage 9 with the inner surface 5. The other part 14 may be constructed as shown in FIG. 1, and includes a rod 27 passing through an opening 28 in part 3 of the spinning chamber, and a circular plate 14 having a circular circumferential portion forming a circular passage 16 with the inner surface 5.

In the embodiment of FIG. 2, part 14' has a tubular portion 18 passing through the central opening 28 in part 3 of the spinning chamber, and a frusto-conical part with a circular circumferential portion forming a circular passage 16 with the inner surface 5.

Parts 14, 14' and 8, and gaps 16 and 9 are located on opposite sides of the fiber retaining and collecting groove 7.

Parts 14, 14 and 8 together form an inner chamber 11 in the withdrawal means 14, 14', 8. The circumferential edges of parts 14, 14 and 8 form between each other a narrow circular circumferential gap which is located directly opposite the circular fiber retaining and collecting groove 7. A fiber strand P formed in groove 7 is withdrawn in the embodiment of FIG. 1 through the outlet tube of funnel-shaped part 8, and in the embodiment of FIG. 2 through the outlet tube 18 of part 14' of the withdrawal means. However, in the embodiment of FIG. 2 it is also possible to guide the fiber strand P through the outlet tube 17 of the funnel-shaped part 8, as in the embodiment of FIG. 1. The fiber is withdrawn in the direction of the arrow 25 by transporting rollers which will be described with reference to FIG. 7.

The fiber strand passes through the circular gap between parts 8, and 14, 14', and the inner chamber 11 of the withdrawal means, and finally through an outlet tube. Therefore, the inner chamber 11 which receives the fiber strand from groove 7, can be considered as an inner spinning space in which the fibers are spun and twisted while passing through the outlet tube. Funnelshaped member 8 forms between itself, cover plate 13, and the inner surface 5, an annular space 10 at thee narrower end 6 of the inner surface 5 into which fibers 24 are supplied through inlet tube 12. Parts 14 or 14' of the withdrawal means form in the spinning chamber a discharge space 15 communicating with the discharge openings 20 at the wider end 19 of the inner surface 5.

Fibers and impurities supplied into space 10 travel along inner surface 5 through gap 9, and into the groove from which the fibers are withdrawn in the form of a twisted strand through the withdrawal means 14, 8. Impurities which are not retained in groove 7 pass through passage 16 into space 15 where substantial suction is produced by the air ejected through openings 20 by the centrifugal force so that the impurities are ejected. On the other hand, air currents are excluded from space 10 into which the fibers are supplied, so that the same can be properly deposited and oriented on the inner surface 5. In the spinning chamber of the prior art, the supplied fibers are exposed to air currents which disturb the move ment on the inner surface of the spinning chamber so that they are irregularly cast against the same and not properly oriented. It is an important feature of the invention, that the withdrawal means 14, 14, 8 separate the fiber inlet means 14 from the discharge means 4, 20 for impurities.

Only the narrow passage 16 permits the travel of the impurities toward the discharge means.

In the embodiments of FIGS. 1 and 2, a continuous frusto-conical inner surface 5 is provided. However, in the modified embodiments of FIGS. 61: and 6b, staggered frusto-conical surfaces are provided on opposite sides of groove 7. The frusto-conical surface portions on opposite sides of groove 7 have different diameters, and in the construction of FIG. 6a, the diameter of the lower frustoconical surface portion is greater than the diameter of the upper frusto-conical surface portion adjacent groove 7. In the embodiment of FIG. 6b, the diameter of the lower frusto-conical surface portion is smaller than the diameter of the higher frusto-conical surface portion adjacent groove 7. The height of the step is between 0.3 mm. and 1 mm. In the construction of FIG. 6a the volume of groove 7 is increased, and in the construction of FIG. 6b, the volume of groove 7 is reduced as compared with the construction of FIGS. 1 and 2. Gaps 9 and 16 between the withdrawal means and the inner surface 5 are preferably about 1 mm. The width of the annular fiber retaining and collecting groove 7 is between 0.3 and 3 mm., depending on the thickness and type of yarn which is to be produced. The circular gap between the circumferential circular edges of parts 14, 14' and 8 of the withdrawal means, can be adjusted by moving parts 14, 14' and 8 toward and away from each other until the width of the gap corresponds to the width of the groove 7. The width of gaps 9 and 16 can be adjusted by simultaneously moving both parts of the withdrawal means in axial direction of the spinning chamber.

Referring now to FIG. 7, the spinning chamber 1 has a pulley 29 driven by a belt 30 from the pulley on the shaft of an electric motor 31 which can be manually started or stopped by a pushbutton switch, not shown. The inlet tube 12 which is mounted on the stationary cover plate 13 communicates with a duct in a body 32 of a fiber separating device which has a combing roller 34 a portion of which projects into the inlet duct. Combing roller 34 has peripheral teeth or needles for combing fibers out of a roving or sliver 53 supplied to combing roller 35 by a feeding roller 40.

Combining roller 34 is driven by a motor 36 through a coupling and a pair of bevel gears 37, 38. Feeding roller 35 is driven by a motor 42 through a coupling and a worm gear drive 40, 41. The spun and twisted yarn P is withdrawn from the withdrawal means 14, 8 by a pair of transporting rollers 43, one of which carries a pulley which is connected by a belt 44 to another pulley 45 on the shaft of a worm gear 46 driven by motor 49' through a coupling and a worm 47. Pulley 45 is also connected by belt 52 to a yarn distributing roller 51 which is operated to form a criss-cross yarn package on a take-up reel 50.

The roving 53 containing impurities is fed by roller 40 to the combing roller 37 which combs fibers containing impurities out of the roving and delivers it to the inlet tube 12 in which suction prevails due to the rotation of spinning chamber 1 which causes explusion of the air through discharge openings 20 by the action of the centrif-ugal force. Negative pressure is produced in the fiber inlet space since air is drawn through passages 9 and 16 into the discharge space 15. The air stream in space 10 and inlet tube 12 moves the fibers toward the narrower end of the inner surface 5 so that the fibers and impurities therein are moved by the centrifugal force along surface 5, through circular passage 9, and into groove 7. During rotation of the spinning chamber, a bundle or strand of fibers is formed which is withdrawn through the inner chamber 11 of the withdrawal means 14, 8, and twisted in the outlet tube 18 or 17.

The impurities are particles of crushed cotton seeds and burr remainder, and it has been found that in one gram of the fiber mass, between 30 and 90 foreign particles are contained, the weight of the impurities being between 1.3 and 6.1 mg. for 1 gram of the fiber mass.

The length and width of most impurities is many times greater than the thickness thereof, one of the dimensions thereof being between 0.6 and 6 mm. so that most impurities are longer than the width of the fiber collecting groove 7. The size of the impurities is influenced by the manner in which the cotton has been processed, and particularly by the carding operation during which very large foreign particles are broken up.

In a preferred embodiment of the invention, the groove is about 1 mm. wide, and at least 1 mm. deep measured at the lowest cross-sectional point thereof. The size of the offset and of the recession, respectively, provided in the inner surface 5 is preferably within the range of 0.3 and 1 mm.

If the impurities are larger than the dimensions of the groove, the centrifugal force causes the particles to cross the groove and move onto the portion of the inner surface 5 located in the discharge space 15 so that the particles are driven by the centrifugal force and by the air stream into and out of the discharge openings 40. In the embodiment of FIG. 6a it is more difficult for the impurities to cross the groove than in the embodiment of FIG. 7 since the impurities have to move over the step formed by the different fr-usto-conical surfaces of surface 5. Some heavy impurities will be stopped by the step, but the withdrawn fiber strand, a part of which rotates with the spinning chamber, lifts the particles out of the groove and over the step in the inner surface 5 above groove 7. In the event that the particles are smaller than the groove dimensions, the particles enter the groove, but are also lifted out by the fiber strand onto the upper portion of the frusto-conical inner surface '5. Several revolutions may be required for removing some of the foreign particles from the groove. If the particles forming the im purities are extremely small, they remain in the fibers and are spun into the fiber strand and yarn, but due to the smallsize of such impurities, they do not cause yarn breakages, and the quality of the twisted yarn is not impaired.

In the embodiment of FIG. 6b, all. larger, and some of the smaller impurities cross the groove easily since the upper portion of the inner surface 5 has a greater diameter than the lower portion. This embodiment is particularly suitable for spinning a yarn from fibers having a relatively small content of big size foreign particles, and also for spinning finer yarns, and also for spinning yarns which are to be completely free of impurities.

A disadvantage of the embodiment of FIG. 6d results in the leakage of fibers across the groove so that some fibers are blown out of the discharge openings 20 and not retained in groove 7 to be spun into the. twisted yarn. Such fiber loss will not occur in the embodiment of FIG. 60! under normal operating conditions when the groove is not completely filled with fibers.

The thickness of the fiber strand formed in the groove, and consequently the thickness of the twisted ya'rn withdrawn through the withdrawal means, depends on the dimensions of the groove 7.

The funnel-shaped circular body 8 which separates the fiber inlet space 10 from the spun yarn P, prevents an adhering of the fibers to the finished spun yarn P. The part 14 or 14' prevents the sucking of the fiber strand and twisted yarn toward the discharge openings 20. In

other words, the withdrawal means 14, 14', 8 separate the supplied fibers from the finished yarn and from the discharge openings.

The withdrawal of the yarn through the inner spinning and twisting space 11 protects the yarn from fibers and impurities already separated from the fibers.

The circular groove 7 can retain only a certain amount of fibers, and surplus fibers will pass through gap 16 and be discharged through discharge openings 23 where they may be collected. However, it is not possible to overfill the fiber retaining and collecting groove 7 as in the constructions of the prior art, and the incidence of thicker portions or slubs in the spun yarn can be reduced to a minimum.

Since it is practically impossible to overload the spinning chamber 1 with fibers and impurities, access to the interior of the spinning chamber is required only in very rare emergency situations. In this event, the upper part 3 of the spinning chamber is lifted after the fastening means, not shown, which may be bolts, bayonet connections, or magnetic means have been released.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of spinning chambers differing from the types described above.

While the invention has been illustrated and described as embodied in a spinning chamber having a fiber retaining and collecting circular groove in a frusto-conical inner surface, and withdrawal means for a spun fiber strand dividing the spinning chamber into a fiber inlet space and a discharge space from which impurities are discharged through openings, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.

1. In a spinning apparatus, in combination, a rotary spinning chamber having an outwardly flaring annular inner surface having a narrower end and a wider end; fiber inlet means communicating with said rotary spinning chamber at said narrower end of said inner surface for placing fibers containing impurities on said inner surface so that said fibers and impurities travel on the same toward said wider end due to the action of the centrifugal force; discharge means communicating with said rotary spinning chamber at said wider end of said inner surface; and annular fiber retaining means extending substantially in a plane perpendicular to the axis of rotation of said spinning chamber, and being located on said inner surface intermediate said ends of the same for retaining only said fibers, but permitting continued movement of said impurities on said inner surface toward said discharge means so that said impurities are discharged through said discharge means.

2. An apparatus as defined in claim 1 wherein said fiber retaining means is an annular groove in said inner surface.

3. An apparatus as defined in claim 2 wherein said flaring annular inner surface has a first portion between said narrower end and said groove and a second portion between said groove and said wider end, said first portion and said second portion having different diameters adjacent said groove.

4. An apparatus as defined in claim 3 wherein said diameter of said first portion is greater than said diameter of said second portion.

5. An apparatus as defined in claim 3 wherein said diameter of said second portion is greater than said diameter of said first portion.

6. An apparatus as defined in claim -1 and comprising withdrawal means for a fiber strand, being located in said spinning chamber intermediate said ends for separating said fiber inlet means from said discharge means for impurities and having an annular portion forming a narrow annular passage for said impurities with said outwardly flaring annular inner surface.

7. An apparatus as defined in claim 6 wherein said '8 withdrawal means is stationary and 'has an outlet tube for said fiber strand located in the axis of rotation of said spinning chamber and projecting out of the same.

8. An apparatus as defined in claim 7 wherein said outlet tube projects out of said spinning chamber at said wider end of said inner surface.

9. An apparatus as defined in claim 7 wherein said outlet tube projects -out of said spinning chamber at said narrower end of said inner surface.

10. An apparatus as defined in claim 6 wherein said fiber strand withdrawal means is stationary and has an annular gap in said annular portion opposite said fiber retaining means, an inner chamber, and an outlet located in the axis of rotation of said spinning chamber whereby the fiber strand formed by said fiber retaining means can be withdrawn through said annular gap, said inner chamber, and said outlet and is twisted in said withdrawal means during rotation of said spinning chamber.

11. An apparatus as defined in claim 10 wherein said outwardly flaring inner surface is of frusto-conical configuration; wherein said fiber retaining means is a circular groove in said inner surface spaced from the ends of the same; and wherein said annular portion of said withdrawal means is circular and is located substantially in said plane so that said gap is substantially aligned with said circular groove.

12. An apparatus as defined in claim 10 wherein said withdrawal means includes a funnel-shaped part located in said spinning chamber at said narrower end of said inner surface and 'having an annular edge closely adjacent said inner surface, said funnel-shaped part forming a fiber inlet chamber with said inner surface between said narr-ower end and said fiber retaining means, and a second part having said annular portion forming said gap with said annular edge of said funnel-shaped part, and forming said annular passage with said inner surface, said funnelshaped part and said second part forming said inner chamber in said withdrawal means, which receives the fiber strand from said fiber retaining groove through said gap.

13. An apparatus as defined in claim 12 wherein each of said parts of said withdrawal means has a tube located in the axis of rotation of said spinning chamber and projecting out of the same; and transporting means located opposite the end of one of said tubes for withdrawing the fiber strand through the respective tube.

14. An apparatus as defined in claim 12 wherein said spinning chamber has an annular wall having said inner surface, said annular wall having a wider end portion and a narrower end portion; and wherein said discharge means include a plurality of circumferential discharge openings in said wider end portion, adjacent discharge openings meeting at said inner surface to form edges on said inner surface so as to facilitate the passage of impurities through said discharge openings.

15. An apparatus as defined in claim 1 wherein said spinning chamber has an annular wall having said inner surface, said annular wall having a wider end portion and a narrower end portion; and wherein said discharge means include a plurality of circumferential discharge openings in said wider end portion, adjacent discharge openings meeting at said inner surface to form edges on said inner surface so as to facilitate the passage of impurities through said discharge openings.

16. An apparatus as defined in claim 15 wherein each discharge opening has a first port on said inner surface and a second port on the outer surface of said wider wall end portion, said first port being wider than said second port, said first ports being separated by said edges.

17. An apparatus as defined in claim -1 wherein said spinning chamber has two parts, one of said parts having open peripheral recesses at said wider end of said inner surface, and the other part closing said recesses partly to form discharge openings connecting the interior of said spinning chamber with the outside and constituting said discharge means.

9 10 18. An apparatus according to claim 17 wherein said 2,928,228 3/1960 Gotzfried 5758.89 parts of said spinning chamber have abutting planar an- 3,115,001 12/1963 Cizek et a1 5758.91 nular faces, said recesses being formed in said planar face 3,163,976 1/ 1965 Juillard 5758.89 of one of said parts, and meeting on said inner surface 3 210 923 10 1965 S hl 57-5895 in edges to facilitate the passage of impurities through 5 said discharge openings. FOREIGN PATENTS 477,259 12/1937 Great Britain. References Cited UNITED S AT PATENTS FRANK J. COHEN, Primary Examiner.

2,911,783 11/1959 Gotzfried 5758.95 1 J. PETRAKES, Assistant Examiner. 

1. IN A SPINNING APPARATUS, IN COMBINATION, A ROTARY SPINNING CHAMBER HAVING AN OUTWARDLY FLARING ANNULAR INNER SURFACE HAVING A NARROWER END AND A WIDER END; FIBER INLET MEANS COMMUNICATING WITH SAID ROTARY SPINNING CHAMBER AT SAID NARROWER END OF SAID INNER SURFACE FOR PLACING FIBERS CONTAINING IMPURITIES ON SAID INNER SURFACE SO THAT SAID FIBERS AND IMPURITIES TRAVEL ON THE SAME TOWARD SAID WIDER END DUE TO THE ACTION OF THE CENTRIFUGAL FORCE; DISCHARGE MEANS COMMUNICATING WITH SAID ROTARY SPINNING CHAMBER AT SAID WIDER END OF SAID INNER SURFACE; 